BRS is using 83.53 lbs and 169.38" to calculate W&B for retrofit aircraft. Obviously, on new builds, you would just weigh the aircraft. BRS said via email that the structure has additional support and/or bypasses baggage area structure, so you are only limited by CG on how much weight in the baggage area.

I'll let y'all make up your own mind on whether this works for you or not.

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